How to go about contacting a Major Corporation?

I have an idea for a product that would perfect an already exisiting product from Nintendo. I have not created the product yet because it wouldn`t really be functional without nintendo`s Wii game system. This is not a game for the system but rather an assesory that would redefine game play. How would I go about contacting Nintedo about this idea without getting the run around, and subsequently seeing my product on their shelves within a couple months? Since this is just an idea I know that there isn`t any way to pantent protect it. The product itself isnt unique but the collaboration of my product and nintendo`s would be. Does anyone have any ideas concerning my predicament?
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Comments
Combining multiple known arts into some novelty usage is patentable, although not as strong.
You really need to talk to a patent attorney.
BTW, if it is just an accessory (without software programming, I assume), why not try to make it yourself?